Have a walnut. Speak your mind. Plan ahead. Tiny but powerful life tweaks that will make you happier, healthier, and—yes!—better.

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Have a Few Walnuts

If you're dragging, consider an unusual suspect: your liver. Thanks to the fatty, carb-heavy American diet, millions of adults are "increasing their odds of liver inflammation and putting themselves on the path toward cirrhosis—and they might never have touched a drink," says Jan Garavaglia, MD, host of the Discovery Health Channel's Dr. G: Medical Examiner and author of How Not to Die: Surprising Lessons on Living Longer, Safer, and Healthier from America's Favorite Medical Examiner. Fatigue and malaise are early symptoms of nonalcoholic fatty liver disease; to help prevent or reverse it, try eating an ounce of walnuts daily; they contain liver-healthy omega-3s. In general, try to replace junk food with fruit, vegetables, fish, and whole grains.